Plasmonic properties of silver in polymer

Puišo, Judita; Prosyčevas, Igoris; Guobienė, Asta; Tamulevičius, Sigitas

doi:10.1016/j.mseb.2007.09.081

Cited by 32 publications

(14 citation statements)

References 29 publications

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“…All the samples tested for EDX were coated with gold to prevent the accumulation of static electric fields during imaging. The Ag BNCs film morphologies were dependent on several factors including polymer solubility, solvent evaporation, total thickness, molecular weight and surface composition [31]. …”

Section: Resultsmentioning

confidence: 99%

Antibacterial activity of silver bionanocomposites synthesized by chemical reduction route

Ahmad

Lim

Shameli

et al. 2012

Chemistry Central Journal

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BackgroundThe aim of this study is to investigate the functions of polymers and size of nanoparticles on the antibacterial activity of silver bionanocomposites (Ag BNCs). In this research, silver nanoparticles (Ag NPs) were incorporated into biodegradable polymers that are chitosan, gelatin and both polymers via chemical reduction method in solvent in order to produce Ag BNCs. Silver nitrate and sodium borohydride were employed as a metal precursor and reducing agent respectively. On the other hand, chitosan and gelatin were added as a polymeric matrix and stabilizer. The antibacterial activity of different sizes of silver nanoparticles was investigated against Gram-positive and Gram-negative bacteria by the disk diffusion method using Mueller-Hinton Agar.ResultsThe properties of Ag BNCs were studied as a function of the polymer weight ratio in relation to the use of chitosan and gelatin. The morphology of the Ag BNCs films and the distribution of the Ag NPs were also characterized. The diameters of the Ag NPs were measured and their size is less than 20 nm. The antibacterial trait of silver/chitosan/gelatin bionanocomposites was investigated. The silver ions released from the Ag BNCs and their antibacterial activities were scrutinized. The antibacterial activities of the Ag BNC films were examined against Gram-negative bacteria (E. coli and P. aeruginosa) and Gram-positive (S. aureus and M. luteus) by diffusion method using Muller-Hinton agar.ConclusionsThe antibacterial activity of Ag NPs with size less than 20 nm was demonstrated and showed positive results against Gram-negative and Gram-positive bacteria. The Ag NPs stabilized well in the polymers matrix.

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Section: Resultsmentioning

confidence: 99%

Antibacterial activity of silver bionanocomposites synthesized by chemical reduction route

Ahmad

Lim

Shameli

et al. 2012

Chemistry Central Journal

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“…Esto indica que la transparencia de las BP depende de la cantidad de nitrato de plata utilizada, lo cual significa que las nanopartículas disminuyen la transparencia de las BP de GBA. Esto se debe a la reducción de la plata formando las AgNPs generando una coloración amarilla parduzca, que es atribuida a la superficie característica de la resonancia del plasmón de AgNPs (Puišo et al, 2008;Zheng et al, 2001). Similares estudios fueron propuestos por Yang et al, (2010) quienes encontraron un incremento en la opacidad de BP a base de GBA al incrementar las proporciones de NaCl2.…”

Section: Espesor Transparencia Y Permeabilidad Al Vapor De Agua De Lunclassified

Biopelículas de Gelana Cargadas con Nanopartículas de Plata: Propiedades Físico Mecánicas, Antimicrobianas y de Barrera

2017

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ResumenSe elaboraron biopelículas a base de gelana de bajo acilo cargadas con nanopartículas de plata (AgNPs) evaluando sus propiedades físico-mecánicas, antimicrobianas y de barrera, después de un almacenamiento de 3 semanas. La actividad antimicrobiana fue evaluada frente a bacterias de origen alimentario (Escherichia coli y Staphylococcus aureus) y dos hongos (Aspergillus sp y Penicillium sp). Los resultados permitieron determinar que el tiempo de almacenamiento influye en todas las propiedades evaluadas. Al incrementar el tiempo de almacenamiento se apreció una disminución en la resistencia a la tensión y en la transparencia. Además se presentó un incremento en el poder antimicrobiano y la permeabilidad al vapor de agua. Este comportamiento probablemente obedece a la lixiviación de iones plata, lo cual disminuye el número de enlaces presentes en la matriz polimérica. Tales resultados son prometedores y sugieren la posibilidad de utilizar biopelículas a base de gelana de bajo acilo como sistema de vehiculización de AgNPs para su liberación gradual manteniendo un efecto antimicrobiano sostenido. Palabras clave: biopelículas; goma gelana; nanopartículas de plata; permeabilidad; resistencia a la tensión Biofilms of Gellan Loaded with Silver Nanoparticles: Physico Mechanical, Antimicrobials and Barrier Properties AbstractBiofilms based on low acyl gellan loaded with silver nanoparticles (AgNPs) were tested, evaluating their physical-mechanical, antimicrobial and barrier properties after 3 weeks of storage. The antimicrobial activity was evaluated against food-borne bacteria (Escherichia coli and Staphylococcus aureus) and two fungi (Aspergillus sp and Penicillium sp). The results showed that the storage time influence all the evaluated properties. Increasing the storage time decreases the tensile strength and transparency values. Also, the antimicrobial power and the water vapor permeability increased. This behavior is probably due to the leaching of silver ions, which decreases the number of bonds present in the polymer matrix. Such results are promising and suggest the possibility of using biofilms based on low acyl gellan as a system for the vehiculation of AgNPs for their gradual release while maintaining a sustained antimicrobial effect.

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“…The brown coloration of A/A/C AgNPs composite film was attributed to the brown color of AgNPs [4]. The brown color of AgNPs is due the characteristic surface plasmon resonance (SPR) of AgNPs [27,28]. Accordingly, the total color difference ( E) of A/A/C AgNPs and A/A/C GSE composite films was significantly (p < 0.05) different from that of the control film.…”

Section: Apparent Color and Optical Properties Of Filmmentioning

confidence: 99%

Preparation and application of agar/alginate/collagen ternary blend functional food packaging films

Wang

Rhim

2015

International Journal of Biological Macromolecules

218

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Plasmonic properties of silver in polymer

Cited by 32 publications

References 29 publications

Antibacterial activity of silver bionanocomposites synthesized by chemical reduction route

Antibacterial activity of silver bionanocomposites synthesized by chemical reduction route

Biopelículas de Gelana Cargadas con Nanopartículas de Plata: Propiedades Físico Mecánicas, Antimicrobianas y de Barrera

Preparation and application of agar/alginate/collagen ternary blend functional food packaging films

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